Deformation behavior of nanocrystalline titania particles accessed by complementary in situ electron microscopy techniques

Herre P, Romeis S, Mackovic M, Przybilla T, Paul J, Schwenger J, Torun B, Grundmaier G, Spiecker E, Peukert W (2017)


Publication Language: English

Publication Type: Journal article, Original article

Publication year: 2017

Journal

Pages Range: 1-14

URI: http://onlinelibrary.wiley.com/doi/10.1111/jace.15072/epdf

DOI: 10.1111/jace.15072

Abstract

The mechanical behavior of nanostructured spherical submicrometer titania parti-
cles was studied by in situ uniaxial compression experiments in the scanning and
transmission electron microscope (SEM and TEM). Mesoporous and amorphous
titania particles were prepared by a wet chemical sol-gel approach. To obtain
nanocrystalline (nc) single-phase anatase and rutile particles the amorphous parti-
cles were cryst allized by high-temperature annealing. For each sample the defor-
mation behavior of at least 50 particles was investigated by in situ compression
experiments in the SEM. In all cases an elastic predominantly plastic deforma-
tion behavior accompanied by crack initiation at exceptionally high engineering
strain values of several percent were observed. Crack propagation presumably
along grain boundaries and a Weibull distributed fracture stress was shown for all
nc particles. Complementary in situ TEM experiment s and ex situ analysis of
focused ion beam prepared particle cross-sections were carried out to identify the
underlying deformati on mechanisms. Grain rotations and grain sliding are
observed for nc anatase particles during in situ compr ession and are further identi-
fied to be linked to a densification of the mesoporous particle structure. Our dedi-
cated prepar ation and quanti tative in situ characterization methodology provides
an excellent basis for a better understanding of the mechanical behavior of
advanced ceramics.

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APA:

Herre, P., Romeis, S., Mackovic, M., Przybilla, T., Paul, J., Schwenger, J.,... Peukert, W. (2017). Deformation behavior of nanocrystalline titania particles accessed by complementary in situ electron microscopy techniques. Journal of the American Ceramic Society, 1-14. https://dx.doi.org/10.1111/jace.15072

MLA:

Herre, Patrick, et al. "Deformation behavior of nanocrystalline titania particles accessed by complementary in situ electron microscopy techniques." Journal of the American Ceramic Society (2017): 1-14.

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